Those numbers are too good to expect.
If 90% right 10% wrong is the baseline would you take as an improvement:
- 80% right 18% I don't know 2% wrong
- 50%/48%/2%
- 10%/90%/0%
- 80%/15%/5%
The general point being that to reduce wrong answers you will need to accept some reduction in right answers if you want the change to only be made through trade-offs. Otherwise you just say "I'd like a better system" and that is rather obvious.
Personally I'd take like 70/27/3. Presuming the 70% of right answers aren't all the trivial questions.
- 80% right 18% I don't know 2% wrong - 50%/48%/2% - 10%/90%/0% - 80%/15%/5%
The general point being that to reduce wrong answers you will need to accept some reduction in right answers if you want the change to only be made through trade-offs. Otherwise you just say "I'd like a better system" and that is rather obvious.
Personally I'd take like 70/27/3. Presuming the 70% of right answers aren't all the trivial questions.